California's 18th Congressional District
California · CA-18
California's 18th Congressional District is one of 52 U.S. House districts in California, represented in Congress by Zoe Lofgren (Democrat). It is home to roughly 772,217 people, with a median age of 34.7. The population is about 65% Hispanic. The median household income is $99,941, and 24% of adults 25 and older hold a bachelor’s degree or higher. In the 2024 presidential election it voted safely Democratic (D+30).
Representative
Current U.S. House member (source: house.gov).
Geography
CA-18 is shown in red. Click a neighboring district to open it, or zoom out to explore the country.
Covering 5,919 square miles, CA-18 is the 124th-largest of the 435 congressional districts by land area. With about 130 residents per square mile, it is a predominantly rural district. Its shape is irregular: the district's Polsby-Popper score of 0.24 ranks 277th of 435 nationally, where 1st is the most compact.
Presidential results
In the 2024 presidential election, 63% of CA-18 voters backed Kamala Harris and 34% Donald Trump — a D+30 margin. That is a 14.0-point shift toward the Republicans from 2020, when the district voted D+44.
Two-party presidential vote by district (source: The Downballot).
Who lives here
The median resident of the district is 34.7 years old; 25.5% of residents are under 18 and 12.2% are 65 or older. About 32.4% of residents were born outside the United States, and 60.8% speak a language other than English at home.
U.S. Census Bureau, American Community Survey (5-year estimates).
Economy & education
At $99,941, the district's median household income ranks 72nd of 435 districts nationwide. The typical owner-occupied home is worth $789,745, and the median rent is $1,982 a month. 11.7% of residents live below the poverty line, and workers average a 31-minute commute (10.2% work from home).
U.S. Census Bureau, American Community Survey (5-year estimates).